There was a reason that they brought back Les Miserables after 3 years. That reason was was that it just became the longest running show in London and they wanted to celebrate that fact by having it back on Broadway. Cameron talked about how he loved that it was playing at the Broadhurst that way both the longest running show in London and the longest running show on Broadway were playing right next door to one another.
As for a Rent revival I would say ten years or so. I feel like for a show like this it isn't a matter of if it is more a matter of when.
I am okay with however they decide to do the show. So long as they keep the music the same. I don't mind new sets or direction or costumes but I would be pissed off if they did something like Rent Remix on us.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll